3AH3_HG11_03_2010-04_en
- 格式：pdf
- 大小：1.26 MB
- 文档页数：48
3AH3VacuumCircuit-Breakers
Medium-VoltageEquipment
SelectionandOrderingData
CatalogHG11.03·2010
Answersforenergy.SiemensHG11.03·
20103AH3VacuumCircuit-Breakers
R-HG11-172.tif
2
213
4
3SiemensHG11.03·20103AH3 Vacuum
Circuit-Breakers
Medium-Voltage Equipment
Catalog HG11.03 · 2010
Invalid: Catalog HG 11.03 · 2008ContentsPageDescriptionGeneralConstruction and mode of operation, standards,maintenance-free design
Ambient conditions, current carrying capacity
and dielectric strength
Product range overview and basic equipment5
6
79
10
Equipment Selection
Ordering data and configuration example
Selection of basic types, circuit-breakers
Selection of secondary equipment
Selection of additional equipment
Accessories and spare parts11
12
13
17
24
25
Technical Data
Electrical data, dimensions and weights
Circuit diagrams
Operating times, short-circuit protection
of motors, consumption data of releases27
28
42
44
Annex
Inquiry form
Configuration instructions
Configuration aid45
46
473AH3VacuumCircuit-BreakersContents
Foldout page4SiemensHG11.03·
20103AH3VacuumCircuit-Breakers
R-HG11-173.tif
1
SiemensHG11.03·2010
5DescriptionContents
ContentsPage
Description
General
Construction and mode of operation:
Switching medium
Pole assemblies
Operating mechanism box
Operating mechanism
Trip-free mechanism
Releases
Closing
Circuit-breaker tripping signal
Interlocking
Standards
Maintenance-free design
Ambient conditions
Current carrying capacity
Dielectric strength
Product range overview
Basic equipment5
6
7
7
7
7
7
8
8
8
8
8
8
9
9
9
10
103AH3VacuumCircuit-Breakers
Industrial application: RefineryR-HG11-174.tif
1
SiemensHG11.03·2010
63AH3 vacuum circuit-breaker from 7.2 kV to 36 kV – The Powerful
The 3AH3 vacuum circuit-breaker is maintenance-free
throughout its entire service life. It is extremely powerful
and controls up to 10,000 operating cycles. This circuit-
breaker is used for high load currents up to 6300 A and high
short-circuit currents up to 72 kA. It covers the common
medium-voltage range from 7.2 kV to 36 kV.Due to its high capacity, the circuit-breaker is especially
suitable for generator operation and industrial applications.
The high-current and generator circuit-breakers 3AH37 and
3AH38 meet the requirements of IEEE Std C37.013.
R
-HG11-204.tif
R-HG11-216.tifDescription
General3AH3VacuumCircuit-Breakers
Circuit-breakers must make and break all currents within
the scope of their ratings: From small inductive and
capacitive load currents up to highshort-circuit currents,controlling all fault conditions in the power system at the
same time.
3AH3 – maintenance-free for high switching capacities
1
SiemensHG11.03·2010
7
1Poleassembly
2Operatingmechanismbox
3Postinsulator
4Operatingrod
5Upperinterruptersupport
6Vacuuminterrupter
7LowerinterruptersupportCircuit-breakerstructureDescription
Construction and mode of operation3AH3VacuumCircuit-Breakers
FrontviewR-HG11-191.tif
OpenoperatingmechanismboxR-HG11-192.tifThe vacuum circuit-breaker consists of the pole assemblies
(1) and the operating mechanism box (2). The pole assem-
blies are fixed to the operating mechanism box via post
insulators (3). The switching movement is transferred by
means of operating rods (4) and levers.
Switching medium
Thevacuumswitchingtechnology,provenandfully
developedformorethan30years,servesasarc-quenching
principlebyusingvacuuminterrupters.
Pole assemblies
The pole assemblies consist of the vacuum interrupters (6)
and the interrupter supports. The vacuum interrupters are
air-insulated and freely accessible. This makes it possible to
clean the insulating parts easily in adverse ambient condi-
tions.Thevacuuminterrupterismountedrigidlytotheupper
interrupter support (5). The lower part of the interrupter is
guided in the lower interrupter support (7), allowingaxial
movement. The braces absorb the external forces resulting
from switching operations and the contact pressure.
Operating mechanism box
The whole operating mechanism with releases, auxiliary
switches, indicators and actuating devices is accommodated
in the operating mechanism box. The extent of the second-
ary equipment depends on the case of application and offers
a multiple variety of options in order to meet almost every
requirement.
Operating mechanism
The operating mechanism is a stored-energy mechanism.
The closing spring is charged either electrically or manually.
It latches tight at the end of the charging process and serves
as an energy store. The force is transmitted from the operat-
ing mechanism to the pole assemblies via operating rods.
To close the breaker, the closing spring can be unlatched
either mechanically by means of the local “ON” pushbutton
or electrically by remote control. The closing spring charges
the opening or contact pressure springs as the breaker
